Remove #pragma once from chrome/browser/sync

chrome/browser/sync/glue/synced_window_delegate_registry.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_
-#pragma once
 
 #include <set>
 
 namespace browser_sync {
 
 class SyncedWindowDelegate;
 
 // A location to register SyncedWindowDelegates such that Android can provide
 // pseudo-browsers for the purposes of Sync without having a dependency from
 // sync onto Android's model of a browser.
 class SyncedWindowDelegateRegistry {
  public:
   static const std::set<SyncedWindowDelegate*>& GetSyncedWindowDelegates();
   static void Register(SyncedWindowDelegate* delegate);
   static void Unregister(SyncedWindowDelegate* delegate);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_